feat: automated nightly scraper + housekeeping

Scraper automation (docker-compose):
- Add scraper service to docker-compose.yml using the same image and
  shared park_data volume; overrides CMD to run scrape-schedule.sh
- scripts/scrape-schedule.sh: runs an initial scrape on container start,
  then sleeps until 3:00 AM (respects TZ env var) and repeats nightly;
  logs timestamps and next-run countdown; non-fatal on scrape errors

Staleness window: 7 days → 72 hours in lib/db.ts so data refreshes
more frequently with the automated schedule in place

Remove favicon: delete app/icon.tsx and public/logo.svg

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/icon.tsx

@@ -1,59 +0,0 @@
-import { ImageResponse } from "next/og";
-
-export const size = { width: 32, height: 32 };
-export const contentType = "image/png";
-
-export default function Icon() {
-  return new ImageResponse(
-    (
-      <div
-        style={{
-          width: 32,
-          height: 32,
-          borderRadius: 8,
-          backgroundColor: "#0c1220",
-          display: "flex",
-          position: "relative",
-        }}
-      >
-        {/* Ground line */}
-        <div
-          style={{
-            position: "absolute",
-            left: 3,
-            right: 3,
-            bottom: 7,
-            height: 2,
-            backgroundColor: "#f59e0b",
-            borderRadius: 1,
-          }}
-        />
-        {/* Lift hill — semicircle bump */}
-        <div
-          style={{
-            position: "absolute",
-            left: 3,
-            bottom: 9,
-            width: 10,
-            height: 13,
-            backgroundColor: "#f59e0b",
-            borderRadius: "50% 50% 0 0",
-          }}
-        />
-        {/* Vertical loop — circle outline */}
-        <div
-          style={{
-            position: "absolute",
-            right: 5,
-            bottom: 7,
-            width: 12,
-            height: 12,
-            border: "2.5px solid #f59e0b",
-            borderRadius: "50%",
-          }}
-        />
-      </div>
-    ),
-    { width: 32, height: 32 },
-  );
-}